CVE-2021-38450
No exploitation reported by the sources we read.
- Published2021-10-27
- Fixed in5.5
- WeaknessCWE-94
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
The affected controllers do not properly sanitize the input containing code syntax. As a result, an attacker could craft code to alter the intended controller flow of the software.
Timeline
dates in UTC- 2021-10-2701:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-38450?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-38450?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.5 | < 5.5 | 5.5 | NVD |
| 5.5 | = 5.5 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.4 | < 4.4 | 4.4 | NVD |
| 4.4 | = 4.4 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.5 | < 5.5 | 5.5 | NVD |
| 5.5 | = 5.5 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Trane Tracer
Tracer Concierge: All versions prior to v5.5 SP3 · Tracer SC: All versions prior to v4.4 SP7 · Tracer SC+: All versions prior to v5.5 SP3
Fix
- Update Trane tracer concierge to 5.5
- Vendor fix CISA ICSA-21-266-02 · 3 productsTracer SC is no longer actively developed, tested, or sold. Tracer SC will be considered end-of-life on December 31, 2022. Trane recommends identifying a migration plan for replacing the Tracer SC controller with the next-generation Tracer SC+ controller. Tracer SC+ can function as a drop-in replac…
- Vendor fix CISA ICSA-21-266-02 · 3 productsTracer SC+: Upgrade to v5.5 SP3 or later
- Mitigation from the vendor CISA ICSA-21-266-02 · 3 productsAffected users should contact a Trane representative to install updated firmware or request additional information. Please reference Trane service database number HUB-205962 when contacting the Trane office.
- Mitigation from the vendor CISA ICSA-21-266-02 · 3 productsTracer SC: Upgrade to v4.4 SP7 or later
- Mitigation from the vendor CISA ICSA-21-266-02 · 3 productsTracer Concierge: Upgrade to v5.5 SP3 or later
- Mitigation from the vendor CISA ICSA-21-266-02 · 3 productsIn addition to the specific recommendations above, Trane continues to recommend the following best practices as an additional protection against this and other controller vulnerabilities:
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- CNACVSS 3.19.9read 2026-10-23
- NVDCVSS 3.18.8read 2026-10-23
- NVDCVSS 2.06.5read 2026-10-23
- CNAweakness (CWE)CWE-94read 2026-10-23
- FIRST EPSSEPSS score1.0 %2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-10-27
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-38450?
Is CVE-2021-38450 actively exploited?
What is the CVSS score for CVE-2021-38450?
Hear about the next vulnerability in your software
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.